Hello, I Am 6 Days Post Partum And By Day

Hello, I am 6 days post partum and by day 3 I noticed I was having extreme anxiety. I brought it to my doctors attention and she put me on Zoloft. However I noticed it’s only bad between 4-9pm and after nine I’m completely fine. Could this be related to the barametic pressure changes. And is there anything I can do to help during these time frames?